Refrigerator



FIG. 1 is a perspective view of a refrigerator showing my ornamental design;

FIG. 2 is a front plan view of the refrigerator embodiment shown in FIG. 1;

FIG. 3 is a right side view of the refrigerator embodiment shown in FIG. 1;

FIG. 4 is a left side view of the refrigerator embodiment shown in FIG. 1;

FIG. 5 is a back plan view of the refrigerator embodiment shown in FIG. 1; and,

FIG. 6 is a top plan view of the refrigerator embodiment shown in FIG. 1. 

The ornamental design for a refrigerator, as shown and described. 